Think about that, you are in a train with a hole to space but theres absolute vacuum and 0 gravity in it. If the train would stop suddenly, then that would be very unhealthy for you since you'd not stop until you hit a wall (and even then you would rebound back ,p)
This is why nobody wants to fly around in a cabin when a spaceship accelerates or de-accelerates, doesn't even matter if theres air.
So without foundation its likely that you will be flying out the hole where there is no foundation the moment velocity changes ^^